Staff at Nintendo Everything have contacted High Voltage Software to inquire about users reporting problems with the online play in the game and have been assured reported faults are being looked at in consultation with Nintendo:

“We have received a few emails from fans regarding multiplayer snags and I assure we’re working hard to fix those issues. It’s difficult to address “glitches” post-release, but we’re working closely with Nintendo to come up with potential solutions.”- Jaramiah Severns, Associate Producer

Nintendo Life readers have opened more than one thread discussing their issues in the forum, but it needs to be emphasised that connection problems experienced by users don't appear to be consistent. Hopefully the issues are server-related and can be rectified without having a firmware update from Nintendo.